/*
* Copyright 2004-2009, Axel Dörfler, axeld@pinc-software.de.
* Copyright 2008, Stephan Aßmus <superstippi@gmx.de>
* Copyright 2008, Philippe Saint-Pierre <stpere@gmail.com>
* Copyright 2011, Rene Gollent, rene@gollent.com.
* Distributed under the terms of the MIT License.
*/
#include "video.h"
#include "bios.h"
#include "vesa.h"
#include "vesa_info.h"
#include "vga.h"
#include "mmu.h"
#include <edid.h>
#include <arch/cpu.h>
#include <boot/stage2.h>
#include <boot/platform.h>
#include <boot/menu.h>
#include <boot/kernel_args.h>
#include <boot/platform/generic/video.h>
#include <util/list.h>
#include <drivers/driver_settings.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define TRACE_VIDEO
#ifdef TRACE_VIDEO
# define TRACE(x) dprintf x
#else
# define TRACE(x) ;
#endif
struct video_mode {
list_link link;
uint16 mode;
uint16 width, height, bits_per_pixel;
uint32 bytes_per_row;
crtc_info_block* timing;
};
static vbe_info_block sInfo;
static video_mode *sMode, *sDefaultMode;
static bool sVesaCompatible;
static struct list sModeList;
static uint32 sModeCount;
static addr_t sFrameBuffer;
static bool sModeChosen;
static bool sSettingsLoaded;
static int
compare_video_modes(video_mode *a, video_mode *b)
{
int compare = a->width - b->width;
if (compare != 0)
return compare;
compare = a->height - b->height;
if (compare != 0)
return compare;
// TODO: compare video_mode::mode?
return a->bits_per_pixel - b->bits_per_pixel;
}
/*! Insert the video mode into the list, sorted by resolution and bit depth.
Higher resolutions/depths come first.
*/
static void
add_video_mode(video_mode *videoMode)
{
video_mode *mode = NULL;
while ((mode = (video_mode *)list_get_next_item(&sModeList, mode))
!= NULL) {
int compare = compare_video_modes(videoMode, mode);
if (compare == 0) {
// mode already exists
return;
}
if (compare > 0)
break;
}
list_insert_item_before(&sModeList, mode, videoMode);
sModeCount++;
}
/*! \brief Finds a video mode with the given resolution.
If \a allowPalette is true, 8-bit modes are considered, too.
If \a height is \c -1, the height is ignored, and only the width
matters.
*/
static video_mode *
find_video_mode(int32 width, int32 height, bool allowPalette)
{
video_mode *found = NULL;
video_mode *mode = NULL;
while ((mode = (video_mode *)list_get_next_item(&sModeList, mode))
!= NULL) {
if (mode->width == width && (height == -1 || mode->height == height)
&& (mode->bits_per_pixel > 8 || allowPalette)) {
if (found == NULL || found->bits_per_pixel < mode->bits_per_pixel)
found = mode;
}
}
return found;
}
/*! Returns the VESA mode closest to the one specified, with a width less or
equal as specified.
The height as well as the depth may vary in both directions, though.
*/
static video_mode *
closest_video_mode(int32 width, int32 height, int32 depth)
{
video_mode *bestMode = NULL;
uint32 bestDiff = 0;
video_mode *mode = NULL;
while ((mode = (video_mode *)list_get_next_item(&sModeList, mode))
!= NULL) {
if (mode->width > width) {
// Only choose modes with a width less or equal than the searched
// one; or else it might well be that the monitor cannot keep up.
continue;
}
uint32 diff = 2 * abs(mode->width - width) + abs(mode->height - height)
+ abs(mode->bits_per_pixel - depth);
if (bestMode == NULL || bestDiff > diff) {
bestMode = mode;
bestDiff = diff;
}
}
return bestMode;
}
static crtc_info_block*
get_crtc_info_block(edid1_detailed_timing& timing)
{
// This feature is only available on chipsets supporting VBE3 and up
if (sInfo.version.major < 3)
return NULL;
// Copy timing structure to set the mode with
crtc_info_block* crtcInfo = (crtc_info_block*)malloc(
sizeof(crtc_info_block));
if (crtcInfo == NULL)
return NULL;
memset(crtcInfo, 0, sizeof(crtc_info_block));
crtcInfo->horizontal_sync_start = timing.h_active + timing.h_sync_off;
crtcInfo->horizontal_sync_end = crtcInfo->horizontal_sync_start
+ timing.h_sync_width;
crtcInfo->horizontal_total = timing.h_active + timing.h_blank;
crtcInfo->vertical_sync_start = timing.v_active + timing.v_sync_off;
crtcInfo->vertical_sync_end = crtcInfo->vertical_sync_start
+ timing.v_sync_width;
crtcInfo->vertical_total = timing.v_active + timing.v_blank;
crtcInfo->pixel_clock = timing.pixel_clock * 10000L;
crtcInfo->refresh_rate = crtcInfo->pixel_clock
/ (crtcInfo->horizontal_total / 10)
/ (crtcInfo->vertical_total / 10);
TRACE(("crtc: h %u/%u/%u, v %u/%u/%u, pixel clock %lu, refresh %u\n",
crtcInfo->horizontal_sync_start, crtcInfo->horizontal_sync_end,
crtcInfo->horizontal_total, crtcInfo->vertical_sync_start,
crtcInfo->vertical_sync_end, crtcInfo->vertical_total,
crtcInfo->pixel_clock, crtcInfo->refresh_rate));
crtcInfo->flags = 0;
if (timing.sync == 3) {
// TODO: this switches the default sync when sync != 3 (compared to
// create_display_modes().
if ((timing.misc & 1) == 0)
crtcInfo->flags |= CRTC_NEGATIVE_HSYNC;
if ((timing.misc & 2) == 0)
crtcInfo->flags |= CRTC_NEGATIVE_VSYNC;
}
if (timing.interlaced)
crtcInfo->flags |= CRTC_INTERLACED;
return crtcInfo;
}
static crtc_info_block*
get_crtc_info_block(edid1_std_timing& timing)
{
// TODO: implement me!
return NULL;
}
static video_mode*
find_edid_mode(edid1_info& info, bool allowPalette)
{
video_mode *mode = NULL;
// try detailed timing first
for (int32 i = 0; i < EDID1_NUM_DETAILED_MONITOR_DESC; i++) {
edid1_detailed_monitor& monitor = info.detailed_monitor[i];
if (monitor.monitor_desc_type == EDID1_IS_DETAILED_TIMING) {
mode = find_video_mode(monitor.data.detailed_timing.h_active,
monitor.data.detailed_timing.v_active, allowPalette);
if (mode != NULL) {
mode->timing
= get_crtc_info_block(monitor.data.detailed_timing);
return mode;
}
}
}
int32 best = -1;
// try standard timings next
for (int32 i = 0; i < EDID1_NUM_STD_TIMING; i++) {
if (info.std_timing[i].h_size <= 256)
continue;
video_mode* found = find_video_mode(info.std_timing[i].h_size,
info.std_timing[i].v_size, allowPalette);
if (found != NULL) {
if (mode != NULL) {
// prefer higher resolutions
if (found->width > mode->width) {
mode = found;
best = i;
}
} else {
mode = found;
best = i;
}
}
}
if (best >= 0)
mode->timing = get_crtc_info_block(info.std_timing[best]);
return mode;
}
static void
vesa_fixups(void *settings)
{
const char *oem_string = (const char *)sInfo.oem_string;
if (!strcmp(oem_string, "NVIDIA")) {
const char *arg = NULL;
int32 scaling = -1;
if (settings != NULL)
arg = get_driver_parameter(settings, "nvidia_scaling", NULL, "1");
if (arg != NULL)
scaling = strtol(arg, NULL, 0);
if (scaling > -1) {
dprintf("Setting nvidia scaling mode to %" B_PRId32 "\n", scaling);
struct bios_regs regs;
regs.eax = 0x4f14;
regs.ebx = 0x0102;
regs.ecx = scaling;
call_bios(0x10, ®s);
}
}
}
static bool
get_mode_from_settings(void)
{
if (sSettingsLoaded)
return true;
void *handle = load_driver_settings("vesa");
if (handle == NULL)
return false;
vesa_fixups(handle);
bool found = false;
const driver_settings *settings = get_driver_settings(handle);
if (settings == NULL)
goto out;
sSettingsLoaded = true;
for (int32 i = 0; i < settings->parameter_count; i++) {
driver_parameter ¶meter = settings->parameters[i];
if (!strcmp(parameter.name, "mode") && parameter.value_count > 2) {
// parameter found, now get its values
int32 width = strtol(parameter.values[0], NULL, 0);
int32 height = strtol(parameter.values[1], NULL, 0);
int32 depth = strtol(parameter.values[2], NULL, 0);
// search mode that fits
video_mode *mode = closest_video_mode(width, height, depth);
if (mode != NULL) {
found = true;
sMode = mode;
}
}
}
out:
unload_driver_settings(handle);
return found;
}
// #pragma mark - vga
static void
vga_set_palette(const uint8 *palette, int32 firstIndex, int32 numEntries)
{
out8(firstIndex, VGA_COLOR_WRITE_MODE);
// write VGA palette
for (int32 i = firstIndex; i < numEntries; i++) {
// VGA (usually) has only 6 bits per gun
out8(palette[i * 3 + 0] >> 2, VGA_COLOR_DATA);
out8(palette[i * 3 + 1] >> 2, VGA_COLOR_DATA);
out8(palette[i * 3 + 2] >> 2, VGA_COLOR_DATA);
}
}
static void
vga_enable_bright_background_colors(void)
{
// reset attribute controller
in8(VGA_INPUT_STATUS_1);
// select mode control register
out8(0x30, VGA_ATTRIBUTE_WRITE);
// read mode control register, change it (we need to clear bit 3), and write it back
uint8 mode = in8(VGA_ATTRIBUTE_READ) & 0xf7;
out8(mode, VGA_ATTRIBUTE_WRITE);
}
// #pragma mark - vesa
static status_t
vesa_get_edid(edid1_info *info)
{
struct bios_regs regs;
regs.eax = 0x4f15;
regs.ebx = 0;
// report DDC service
regs.ecx = 0;
regs.es = 0;
regs.edi = 0;
call_bios(0x10, ®s);
TRACE(("EDID1: %lx\n", regs.eax));
// %ah contains the error code
// %al determines whether or not the function is supported
if (regs.eax != 0x4f)
return B_NOT_SUPPORTED;
TRACE(("EDID2: ebx %lx\n", regs.ebx));
// test if DDC is supported by the monitor
if ((regs.ebx & 3) == 0)
return B_NOT_SUPPORTED;
edid1_raw edidRaw;
regs.eax = 0x4f15;
regs.ebx = 1;
// read EDID
regs.ecx = 0;
regs.edx = 0;
regs.es = ADDRESS_SEGMENT(&edidRaw);
regs.edi = ADDRESS_OFFSET(&edidRaw);
call_bios(0x10, ®s);
TRACE(("EDID3: %lx\n", regs.eax));
if (regs.eax != 0x4f)
return B_NOT_SUPPORTED;
// retrieved EDID - now parse it
edid_decode(info, &edidRaw);
#ifdef TRACE_VIDEO
edid_dump(info);
#endif
return B_OK;
}
static status_t
vesa_get_mode_info(uint16 mode, struct vbe_mode_info *modeInfo)
{
memset(modeInfo, 0, sizeof(vbe_mode_info));
struct bios_regs regs;
regs.eax = 0x4f01;
regs.ecx = mode;
regs.es = ADDRESS_SEGMENT(modeInfo);
regs.edi = ADDRESS_OFFSET(modeInfo);
call_bios(0x10, ®s);
// %ah contains the error code
if ((regs.eax & 0xff00) != 0)
return B_ENTRY_NOT_FOUND;
return B_OK;
}
static status_t
vesa_get_vbe_info_block(vbe_info_block *info)
{
memset(info, 0, sizeof(vbe_info_block));
info->signature = VBE2_SIGNATURE;
struct bios_regs regs;
regs.eax = 0x4f00;
regs.es = ADDRESS_SEGMENT(info);
regs.edi = ADDRESS_OFFSET(info);
call_bios(0x10, ®s);
// %ah contains the error code
if ((regs.eax & 0xff00) != 0)
return B_ERROR;
if (info->signature != VESA_SIGNATURE)
return B_ERROR;
dprintf("VESA version = %d.%d, capabilities %lx\n", info->version.major,
info->version.minor, info->capabilities);
if (info->version.major < 2) {
dprintf("VESA support too old\n");
return B_ERROR;
}
info->oem_string = SEGMENTED_TO_LINEAR(info->oem_string);
info->mode_list = SEGMENTED_TO_LINEAR(info->mode_list);
dprintf("OEM string: %s\n", (const char *)info->oem_string);
return B_OK;
}
static status_t
vesa_init(vbe_info_block *info, video_mode **_standardMode)
{
if (vesa_get_vbe_info_block(info) != B_OK)
return B_ERROR;
// fill mode list and find standard video mode
video_mode *standardMode = NULL;
for (int32 i = 0; true; i++) {
uint16 mode = ((uint16 *)info->mode_list)[i];
if (mode == 0xffff)
break;
struct vbe_mode_info modeInfo;
if (vesa_get_mode_info(mode, &modeInfo) == B_OK) {
TRACE((" 0x%03x: %u x %u x %u (a = %d, mem = %d, phy = %lx, p = %d, b = %d)\n", mode,
modeInfo.width, modeInfo.height, modeInfo.bits_per_pixel, modeInfo.attributes,
modeInfo.memory_model, modeInfo.physical_base, modeInfo.num_planes,
modeInfo.num_banks));
TRACE((" mask: r: %d %d g: %d %d b: %d %d dcmi: %d\n",
modeInfo.red_mask_size, modeInfo.red_field_position,
modeInfo.green_mask_size, modeInfo.green_field_position,
modeInfo.blue_mask_size, modeInfo.blue_field_position,
modeInfo.direct_color_mode_info));
const uint32 requiredAttributes = MODE_ATTR_AVAILABLE
| MODE_ATTR_GRAPHICS_MODE | MODE_ATTR_COLOR_MODE
| MODE_ATTR_LINEAR_BUFFER;
if (modeInfo.width >= 640
&& modeInfo.physical_base != 0
&& modeInfo.num_planes == 1
&& (modeInfo.memory_model == MODE_MEMORY_PACKED_PIXEL
|| modeInfo.memory_model == MODE_MEMORY_DIRECT_COLOR)
&& (modeInfo.attributes & requiredAttributes)
== requiredAttributes) {
// this mode fits our needs
video_mode *videoMode = (video_mode *)malloc(
sizeof(struct video_mode));
if (videoMode == NULL)
continue;
videoMode->mode = mode;
videoMode->bytes_per_row = modeInfo.bytes_per_row;
videoMode->width = modeInfo.width;
videoMode->height = modeInfo.height;
videoMode->bits_per_pixel = modeInfo.bits_per_pixel;
videoMode->timing = NULL;
if (modeInfo.bits_per_pixel == 16
&& modeInfo.red_mask_size + modeInfo.green_mask_size
+ modeInfo.blue_mask_size == 15) {
// this is really a 15-bit mode
videoMode->bits_per_pixel = 15;
}
add_video_mode(videoMode);
}
} else
TRACE((" 0x%03x: (failed)\n", mode));
}
// Choose default resolution (when no EDID information is available)
const uint32 kPreferredWidth = 1024;
const uint32 kFallbackWidth = 800;
standardMode = find_video_mode(kPreferredWidth, -1, false);
if (standardMode == NULL) {
standardMode = find_video_mode(kFallbackWidth, -1, false);
if (standardMode == NULL) {
standardMode = find_video_mode(kPreferredWidth, -1, true);
if (standardMode == NULL)
standardMode = find_video_mode(kFallbackWidth, -1, true);
}
}
if (standardMode == NULL) {
// just take any mode
standardMode = (video_mode *)list_get_first_item(&sModeList);
}
if (standardMode == NULL) {
// no usable VESA mode found...
return B_ERROR;
}
TRACE(("Using mode 0x%03x\n", standardMode->mode));
*_standardMode = standardMode;
return B_OK;
}
#if 0
static status_t
vesa_get_mode(uint16 *_mode)
{
struct bios_regs regs;
regs.eax = 0x4f03;
call_bios(0x10, ®s);
if ((regs.eax & 0xffff) != 0x4f)
return B_ERROR;
*_mode = regs.ebx & 0xffff;
return B_OK;
}
#endif
static status_t
vesa_set_mode(video_mode* mode, bool useTiming)
{
struct bios_regs regs;
regs.eax = 0x4f02;
regs.ebx = (mode->mode & SET_MODE_MASK) | SET_MODE_LINEAR_BUFFER;
if (useTiming && mode->timing != NULL) {
regs.ebx |= SET_MODE_SPECIFY_CRTC;
regs.es = ADDRESS_SEGMENT(mode->timing);
regs.edi = ADDRESS_OFFSET(mode->timing);
}
call_bios(0x10, ®s);
if ((regs.eax & 0xffff) != 0x4f)
return B_ERROR;
#if 0
// make sure we have 8 bits per color channel
regs.eax = 0x4f08;
regs.ebx = 8 << 8;
call_bios(0x10, ®s);
#endif
return B_OK;
}
static status_t
vesa_set_palette(const uint8 *palette, int32 firstIndex, int32 numEntries)
{
// is this an 8 bit indexed color mode?
if (gKernelArgs.frame_buffer.depth != 8)
return B_BAD_TYPE;
#if 0
struct bios_regs regs;
regs.eax = 0x4f09;
regs.ebx = 0;
regs.ecx = numEntries;
regs.edx = firstIndex;
regs.es = (addr_t)palette >> 4;
regs.edi = (addr_t)palette & 0xf;
call_bios(0x10, ®s);
if ((regs.eax & 0xffff) != 0x4f) {
#endif
// the VESA call does not work, just try good old VGA mechanism
vga_set_palette(palette, firstIndex, numEntries);
#if 0
return B_ERROR;
}
#endif
return B_OK;
}
// #pragma mark -
bool
video_mode_hook(Menu *menu, MenuItem *item)
{
// find selected mode
video_mode *mode = NULL;
menu = item->Submenu();
item = menu->FindMarked();
if (item != NULL) {
switch (menu->IndexOf(item)) {
case 0:
// "Default" mode special
sMode = sDefaultMode;
sModeChosen = false;
return true;
case 1:
// "Standard VGA" mode special
// sets sMode to NULL which triggers VGA mode
break;
default:
mode = (video_mode *)item->Data();
break;
}
}
if (mode != sMode) {
// update standard mode
// ToDo: update fb settings!
sMode = mode;
}
sModeChosen = true;
return true;
}
Menu *
video_mode_menu()
{
Menu *menu = new(nothrow) Menu(CHOICE_MENU, "Select Video Mode");
MenuItem *item;
menu->AddItem(item = new(nothrow) MenuItem("Default"));
item->SetMarked(true);
item->Select(true);
item->SetHelpText("The Default video mode is the one currently configured "
"in the system. If there is no mode configured yet, a viable mode will "
"be chosen automatically.");
menu->AddItem(new(nothrow) MenuItem("Standard VGA"));
video_mode *mode = NULL;
while ((mode = (video_mode *)list_get_next_item(&sModeList, mode)) != NULL) {
char label[64];
snprintf(label, sizeof(label), "%ux%u %u bit", mode->width,
mode->height, mode->bits_per_pixel);
menu->AddItem(item = new(nothrow) MenuItem(label));
item->SetData(mode);
}
menu->AddSeparatorItem();
menu->AddItem(item = new(nothrow) MenuItem("Return to main menu"));
item->SetType(MENU_ITEM_NO_CHOICE);
return menu;
}
static void
set_vga_mode(void)
{
// sets 640x480 16 colors graphics mode
bios_regs regs;
regs.eax = 0x0012;
call_bios(0x10, ®s);
}
static void
set_text_mode(void)
{
// sets 80x25 text console
bios_regs regs;
regs.eax = 0x0003;
call_bios(0x10, ®s);
video_hide_text_cursor();
}
void
video_move_text_cursor(int x, int y)
{
bios_regs regs;
regs.eax = 0x0200;
regs.ebx = 0;
regs.edx = (y << 8) | x;
call_bios(0x10, ®s);
}
void
video_show_text_cursor(void)
{
bios_regs regs;
regs.eax = 0x0100;
regs.ecx = 0x0607;
call_bios(0x10, ®s);
}
void
video_hide_text_cursor(void)
{
bios_regs regs;
regs.eax = 0x0100;
regs.ecx = 0x2000;
call_bios(0x10, ®s);
}
// #pragma mark - blit
void
platform_blit4(addr_t frameBuffer, const uint8 *data,
uint16 width, uint16 height, uint16 imageWidth, uint16 left, uint16 top)
{
if (!data)
return;
// ToDo: no boot logo yet in VGA mode
#if 1
// this draws 16 big rectangles in all the available colors
uint8 *bits = (uint8 *)frameBuffer;
uint32 bytesPerRow = 80;
for (int32 i = 0; i < 32; i++) {
bits[9 * bytesPerRow + i + 2] = 0x55;
bits[30 * bytesPerRow + i + 2] = 0xaa;
}
for (int32 y = 10; y < 30; y++) {
for (int32 i = 0; i < 16; i++) {
out16((15 << 8) | 0x02, VGA_SEQUENCER_INDEX);
bits[32 * bytesPerRow + i*2 + 2] = i;
if (i & 1) {
out16((1 << 8) | 0x02, VGA_SEQUENCER_INDEX);
bits[y * bytesPerRow + i*2 + 2] = 0xff;
bits[y * bytesPerRow + i*2 + 3] = 0xff;
}
if (i & 2) {
out16((2 << 8) | 0x02, VGA_SEQUENCER_INDEX);
bits[y * bytesPerRow + i*2 + 2] = 0xff;
bits[y * bytesPerRow + i*2 + 3] = 0xff;
}
if (i & 4) {
out16((4 << 8) | 0x02, VGA_SEQUENCER_INDEX);
bits[y * bytesPerRow + i*2 + 2] = 0xff;
bits[y * bytesPerRow + i*2 + 3] = 0xff;
}
if (i & 8) {
out16((8 << 8) | 0x02, VGA_SEQUENCER_INDEX);
bits[y * bytesPerRow + i*2 + 2] = 0xff;
bits[y * bytesPerRow + i*2 + 3] = 0xff;
}
}
}
// enable all planes again
out16((15 << 8) | 0x02, VGA_SEQUENCER_INDEX);
#endif
}
extern "C" void
platform_set_palette(const uint8 *palette)
{
switch (gKernelArgs.frame_buffer.depth) {
case 4:
//vga_set_palette((const uint8 *)kPalette16, 0, 16);
break;
case 8:
if (vesa_set_palette((const uint8 *)palette, 0, 256) != B_OK)
dprintf("set palette failed!\n");
break;
default:
break;
}
}
// #pragma mark -
extern "C" void
platform_switch_to_logo(void)
{
// in debug mode, we'll never show the logo
if ((platform_boot_options() & BOOT_OPTION_DEBUG_OUTPUT) != 0)
return;
addr_t lastBase = gKernelArgs.frame_buffer.physical_buffer.start;
size_t lastSize = gKernelArgs.frame_buffer.physical_buffer.size;
if (sVesaCompatible && sMode != NULL) {
if (!sModeChosen)
get_mode_from_settings();
// On some BIOS / chipset / monitor combinations, there seems to be a
// timing issue between getting the EDID data and setting the video
// mode. As such we wait here briefly to give everything enough time
// to settle.
spin(1000);
if ((sMode->timing == NULL || vesa_set_mode(sMode, true) != B_OK)
&& vesa_set_mode(sMode, false) != B_OK)
goto fallback;
struct vbe_mode_info modeInfo;
if (vesa_get_mode_info(sMode->mode, &modeInfo) != B_OK)
goto fallback;
gKernelArgs.frame_buffer.width = modeInfo.width;
gKernelArgs.frame_buffer.height = modeInfo.height;
gKernelArgs.frame_buffer.bytes_per_row = modeInfo.bytes_per_row;
gKernelArgs.frame_buffer.depth = modeInfo.bits_per_pixel;
gKernelArgs.frame_buffer.physical_buffer.size
= (phys_size_t)modeInfo.bytes_per_row
* (phys_size_t)gKernelArgs.frame_buffer.height;
gKernelArgs.frame_buffer.physical_buffer.start = modeInfo.physical_base;
} else {
fallback:
// use standard VGA mode 640x480x4
set_vga_mode();
gKernelArgs.frame_buffer.width = 640;
gKernelArgs.frame_buffer.height = 480;
gKernelArgs.frame_buffer.bytes_per_row = 80;
gKernelArgs.frame_buffer.depth = 4;
gKernelArgs.frame_buffer.physical_buffer.size
= (phys_size_t)gKernelArgs.frame_buffer.width
* (phys_size_t)gKernelArgs.frame_buffer.height / 2;
gKernelArgs.frame_buffer.physical_buffer.start = 0xa0000;
}
dprintf("video mode: %ux%ux%u\n", gKernelArgs.frame_buffer.width,
gKernelArgs.frame_buffer.height, gKernelArgs.frame_buffer.depth);
gKernelArgs.frame_buffer.enabled = true;
// If the new frame buffer is either larger than the old one or located at
// a different address, we need to remap it, so we first have to throw
// away its previous mapping
if (lastBase != 0
&& (lastBase != gKernelArgs.frame_buffer.physical_buffer.start
|| lastSize < gKernelArgs.frame_buffer.physical_buffer.size)) {
mmu_free((void *)sFrameBuffer, lastSize);
lastBase = 0;
}
if (lastBase == 0) {
// the graphics memory has not been mapped yet!
sFrameBuffer = mmu_map_physical_memory(
gKernelArgs.frame_buffer.physical_buffer.start,
gKernelArgs.frame_buffer.physical_buffer.size, kDefaultPageFlags);
}
video_display_splash(sFrameBuffer);
}
extern "C" void
platform_switch_to_text_mode(void)
{
if (!gKernelArgs.frame_buffer.enabled) {
vga_enable_bright_background_colors();
return;
}
set_text_mode();
gKernelArgs.frame_buffer.enabled = 0;
vga_enable_bright_background_colors();
}
extern "C" status_t
platform_init_video(void)
{
gKernelArgs.frame_buffer.enabled = 0;
list_init(&sModeList);
set_text_mode();
// You may wonder why we do this here:
// Obviously, some graphics card BIOS implementations don't
// report all available modes unless you've done this before
// getting the VESA information.
// One example of those is the SiS 630 chipset in my laptop.
sVesaCompatible = vesa_init(&sInfo, &sDefaultMode) == B_OK;
if (!sVesaCompatible) {
TRACE(("No VESA compatible graphics!\n"));
gKernelArgs.vesa_capabilities = 0;
return B_ERROR;
}
gKernelArgs.vesa_capabilities = sInfo.capabilities;
TRACE(("VESA compatible graphics!\n"));
// store VESA modes into kernel args
vesa_mode *modes = (vesa_mode *)kernel_args_malloc(
sModeCount * sizeof(vesa_mode));
if (modes != NULL) {
video_mode *mode = NULL;
uint32 i = 0;
while ((mode = (video_mode *)list_get_next_item(&sModeList, mode))
!= NULL) {
modes[i].mode = mode->mode;
modes[i].width = mode->width;
modes[i].height = mode->height;
modes[i].bits_per_pixel = mode->bits_per_pixel;
i++;
}
gKernelArgs.vesa_modes = modes;
gKernelArgs.vesa_modes_size = sModeCount * sizeof(vesa_mode);
}
edid1_info info;
// Note, we currently ignore EDID information for VBE2 - while the EDID
// information itself seems to be reliable, older chips often seem to
// use very strange default timings with higher modes.
// TODO: Maybe add a setting to enable it anyway?
if (sInfo.version.major >= 3 && vesa_get_edid(&info) == B_OK) {
// we got EDID information from the monitor, try to find a new default
// mode
video_mode *defaultMode = find_edid_mode(info, false);
if (defaultMode == NULL)
defaultMode = find_edid_mode(info, true);
if (defaultMode != NULL) {
// We found a new default mode to use!
sDefaultMode = defaultMode;
}
gKernelArgs.edid_info = kernel_args_malloc(sizeof(edid1_info));
if (gKernelArgs.edid_info != NULL)
memcpy(gKernelArgs.edid_info, &info, sizeof(edid1_info));
}
sMode = sDefaultMode;
return B_OK;
}
↑ V763 Parameter 'menu' is always rewritten in function body before being used.